#define BLYNK_TEMPLATE_ID "TMPL3uigIMDW4"
#define BLYNK_TEMPLATE_NAME "iot mini project"
#define BLYNK_AUTH_TOKEN "sWRbJ3JejzBZYSFTcKMGz3saTBlH9yDT"
#define BLYNK_PRINT Serial
     
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <string.h>
#include <DHT.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
// DHT define

char auth[] = BLYNK_AUTH_TOKEN;

char ssid[] = "Wokwi-GUEST";
char pass[] = "";

#define Buzzer 33
#define DHTPIN 4       // DHT sensor data pin
#define DHTTYPE DHT22  // DHT sensor type (DHT11 or DHT22)
DHT dht(DHTPIN, DHTTYPE);

#define RED_LED 2    // Red LED connected to GPIO 2
#define GREEN_LED 15 // Green LED connected to GPIO 15
#define SCREEN_WIDTH 128 // OLED width,  in pixels
#define SCREEN_HEIGHT 64

Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);


void setup() {
  Serial.begin(115200);

  dht.begin();

  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
  oled.clearDisplay();
  oled.setTextSize(1); 
  oled.setTextColor(WHITE);

  pinMode(RED_LED, OUTPUT);
  pinMode(GREEN_LED, OUTPUT);
  pinMode(Buzzer, OUTPUT);

  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected");

  Blynk.begin(auth, ssid, pass);
}

void loop() {
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor");
    return;
  }

  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print("%, Temperature: ");
  Serial.print(temperature);
  Serial.println("°C");

  if (humidity > 60 && temperature > 25) {
    digitalWrite(RED_LED, HIGH);
    digitalWrite(GREEN_LED, LOW);
    oled.clearDisplay();
    oled.setCursor(0, 0);
    oled.print("Temperature:");
    oled.println(temperature);
    oled.print("\n");
    oled.print("Humidity:");
    oled.println(humidity);
    oled.print("\n");
    oled.println("Status: High");
    oled.display();

    tone(Buzzer, 100, 1000);
  } 
  
  else {
    digitalWrite(RED_LED, LOW);
    digitalWrite(GREEN_LED, HIGH);
    oled.clearDisplay();
    oled.setCursor(0, 0);
    oled.print("Temperature:");
    oled.println(temperature);
    oled.print("\n");
    oled.print("Humidity:");
    oled.println(humidity);
    oled.print("\n");
    oled.println("Status: Normal");
    oled.display();
  }

  Blynk.virtualWrite(V1, humidity);
  Blynk.virtualWrite(V2, temperature);

  delay(3000);
}